Injector



E. O. COREY May 19, 1936.

`INJECTOR Filed Feb. 8, 1935 l I HVVENTOR` wmf/( ATTORNEYS Patented May 19, 1936 UNITED STATES PATENTl OFFICE INJECTOR Application `llebruary 8, 1935, Serial No. 5,624

2 Claims.

This invention relates to improvements in injectors or inspirators and particularly to the forcer nozzle, also known or designated as a combining and delivery tube having a converging- "'diverging bore forming a continuous longitudinal passage without interruption or lateral openings.

The tube, in its position within the injector, receives steam from a steam nozzle in an axial relation therewith, the action of the steam directed into the converging or combining tube portionor section draws the water into the tube and forces it through the diverging bore or delivery tube portion or section into the boiler to be supplied.v

Injectors of the type illustrated are used on steam locomotives for forcing water into the boiler of the locomotive by the action of steam generated in the boiler thereof, and for delivering the Water into the boiler at a pressure above the steam pressure of the boiler and work on a range from, say, 30 to 350 pounds pressure and above of delivered water without any change in the volume of steam being used.

The type Iof injector herein disclosed in which the tube of the present invention is installed, is classied as a non-axial flow type having two banks or sets of tubes respectively disposed in compartments alongside one another for dividing the duty. One set combines steam and water together and discharges or delivers the water at a predetermined pressure to the second set of tubes in which the tube .of the present invention is incorporated, and performs the same operation of mixing a proper proportion of steam and water,

.only delivering the water at a higher or increased pressure and above the steam pressure of the boiler from which it receives its steam supply. This type of injector is merely selected for illustrative purposes, showing one manner in which the combining and delivery tube is incorporated within an injector, recognizing that the tube is also available for axial flow types of injectors in which all of the tubes in the makeup of the injector are in line with one another.

Reference, therefore, will be primarily directed to the combining and delivery tube, its structure and method of mounting Within the injector casing, rather than to any structure or performance of the injector in which the tube is a component, as the tube of the present invention is contemplated to be used in interchange or replacement for a worn tube without any change or alteration to the injector for its installation, or without any change in the bore configuration and dimension from that possessed by the worn (Cl. 10S-264) tube when new, with which it is interchanged. The bore may follow standard or special cross sectional measurements and various degrees of taper for .obtaining the most eflicient results in a given type of injector, recognizing that the con- 5 figuration is all-important for obtaining the most beneficial results and which, as established, it is desirable to maintain as long as possible, it being experienced that any appreciable wear pitting the surface of the bore of the tube affects or de- 10 stroys its utility and eiiiciency.

It has been experienced with a combining and delivery tube in vwhich the bore diverges from the opposite ends of an intermediate, straight, restricted or small diameter point or portion, ac- 15 cording to some configurations or tapers of bore, that the wear is more severe within the delivery section or portion of the tube, and in a zone immediately beyond or adjacent the discharge side of the smallest diameter or restricted bore por- 20 tion.

It therefore is an object of the invention to provide a forcer or combining and delivery tube of separable sections, constituting a combining tube or section and a delivery tube or section 5i separably connected, with a wear-resisting inner or intermediate tube section removably engaged and extended into relatively opposite adjoining ends of said combining and delivery sections, and confined therein or therebetween when the com- T10 bining and delivery tube sections are united, the intermediate section possessing the most critical and vital bore portions of the tube Within which the action of the fluid passing therethrough is more severe to cause wear. Wear resisting qual- 3J ities of the intermediate section therefore provides for maintaining the eiiiciency of the injector for longer periods, and readily replaceable with a new section when it ultimately becomes worn. 40

Another object of the invention is to provide a section or separable combining and delivery tube, the tube readily removable as a unit from its fixed position within the injector casing through a plug-closed opening in the casing@ 4') Other objects and further advantages will be more fully apparent from a description of the accompanying drawing, in which:

Figure 1 is a central longitudinal section through the improved forcer or combining and 50 delivery tube of an injector.

Figure'2 is an end view of the tube as viewed from the receiving end thereof.

Figure 3 is a central section through a commercial or conventional form of non-axial flow 55 type of injector disclosing the improved combinlarge enough to allow the entrance of an approing and delivery tube installed therein.

Upon reference to Figure 3, representing a commercial design of injector of non-axial flow type, I indicates the body or casing internally divided into several chambers or compartments, 2, 3, 4, and 5, a lifter or steam nozzle 6 extended into one end of the chamber or compartment 2, and receives its supply steam from a conduit 'I. The chamber 2 is provided with a valve controlled water inlet 8 and communicates with the chamber 3 through a nozzle or lifter tube 9 in axial alignment with the nozzle 6. The steam ejected from the nozzle E into the receiving end of the tube 9 delivers the water within chamber 2 through the tube 9 into chamber 3, and the water is thereby forced from the chamber 3 into the chamber` 4 through a port I connecting the chambers 3 and 4.

A forcer nozzle I I is extended slightly into the receiving end of a forcer combining anddelivery tube or nozzle I2, in axial alignment with the nozzle II. The forcer or combining and delivery tube I2 connects the chambers 4 and 5, the chamber constituting a delivery compartment and connecting with the boiler through a valve controlled outlet I3.

The forcer or combining and delivery tube I2 to which the present invention is directed comprises a plurality of tube sections I3, I4, and I5, readily separable from one another, the tube section I3 being designated as the receiving or combining tube section, the tube section I4 as the delivery section, and the section I5 as an intel'- mediate or liner section formed of a wear-resisting material. The combining tube section I3 has a converging bore I6, when considered in relation to the inlet end of the tube, for a definite portion of its length, and a counter bore I2' for the remainder of its length and toward the opposite end thereof providing a socket for the reception of an end of the intermediate or liner tube section I5. The liner tube section I5 for a portion of its length and at the end which is disposed or engaged into the delivery tube section, has a diverging bore, and in the instance illustrated of different degrees of taper joining with or serving as a continuation of the'diverging bore of the combining tube section I3.

The inner end of the tube section I3 is eX- ternally screw threaded and internally connects into the hub end I8 of the inner end of the delivery tube section I 4, for separably connecting the tube sections and rigidly securing and confining the liner tube section within and between the combining tube section I3 and the delivery tube section I4. The hub I8 of the delivery tube section i4 is externally screw threaded for securing the tube unit into a partition wall within the injector casing in substantially the same manner as has been practiced for installing an integral type of combining and delivery tube of the prior art.

The unit is bodily'removable from the casing as separation of the sections can only be accomplished when the unit is removed from the casing. This is very desirable for railroad regulations requiring periodical inspection of the tubes, as the inspector has before him the entire unit for observing its condition and a renewal of any of the parts can be made if required. The unit is removed from the injector through an opening in the casing in line with the tube, the opening being covered by a screw plug I9, of. a diameter prite tool or wrench for engaging with the Spanner lugs 23 formed integral with and upon the forward side of the hub I8.

The delivery tube section I4 has a diverging bore 2l for a determined length from the outer or free end of the tube, and a counter bore 22 for the remainder of its length, preferably of the same dimension as the counter bore in the combining tube section I3, for the reception of the opposite end of the intermediate or liner tube section I5. The lirici' tube section has an intermediate straight bore portion 23 forming that part of the passage of the tube unit which is of the smallest cross section or diameter, and from which the bore diverges to the end of the liner section to merge or continue with the diverging bore portion of the delivery tube section I4.

The juncture of the liner tube section and the combining tube section is preferably at a meeting line at which a change in the degree of tapers occurs, or at a length from the smallest bore portion of the liner tube at which, if an unevenness or interruption should result due to non-registering of the bore circumferences or surfaces, it would not be injurious to the action of the injector. The liner tube section, therefore, has an end fitting into the combining tube section having a converging bore portion continuous with the converging bore portion of said section, and the opposite end of said liner tube section fitting into the delivery tube section having a diverging bore portion joining or continuous with the diverging bore portion of the delivery tube section.

The liner section, therefore, contains such portions of the passage which has the smallest diameter in cross section and such converging and diverging portions at opposite sides from the smaller diameter devoid of any joints or lateral outlets for the critical or vital portions of the passage in which any unevenness would injuriously affect the action of the injector. This, therefore, renders it applicable to axial flow types of injectors having lateral openings in theA delivery tube section Having described my invention, I claim:

l. A tube structure for use Within an injector casing, comprising, a combining tube section having a bore which gradually decreases in diameter from its entrance end for a determined portion of its length, a delivery tube section having a bore which gradually increases in diameter toward its discharge end for a determined portion of its length, said sections separably united by a screw-threaded connection in end-to-end axial alignment, and a liner tube longitudinally interveningly socketed within the opposing vends of said combining and delivery tube sections with its opposing ends respectively in abutting shouldered union engagement with said tube sections and of a length to space the relative opposing ends of said sections when the parts are assembled, said liner tube having a converging-diverging bore therethrough in end registration with the bore of each of said sections forming a continuation thereof, the bore of said parts providing a passage devoid of lateral outlets, with the smaller diameter thereof intermediate of the liner tube.

2. A tube structure for use within an injector casing, comprising, a combining tube section having a bore which gradually decreases in diameter from its entrance end for a determined portionI of its length, a delivery tube section having a bore which gradually increases in diameter toward its discharge end for a determined portion of its length, said sections separably united by a screwthreaded connection in end-to-end axial alignment, and a third tube longitudinally interveningly engaged with said combining and delivery tube sections in shouldered union therewith and compressibly through the coupling connection of said combining and delivery tube sections, said third tube having a converging-diverging bore therethrough in end registration with the bore of each of said sections forming a continuation thereof, and a passage through the assembled parts devoid of lateral outlets, with the smaller diameter thereof intermediate of the third tube.

ELMER O. COREY. 

